In the American Association of Physics Teachers’ annual High School Physics Photo Contest, students worldwide are invited to submit an original photograph, together with an essay describing the physics in it. This photo, by Paige Rosemary Frankl in Whitney Mernitz’s class at Cherry Creek High School in Greenwood Village, Colorado, was the runner-up in this year’s “Natural” category. This caption accompanied the photo:

To submit candidate images for Back Scatter, visit http://contact.physicstoday.org.

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